Double click on the selected NPC and a window will pop-up like the one shown in picture Importing an existing face. Usually on Nexus Mods, you can find a more detailed description of where to put mods in the load order.| In the Object window expand the menu Actor and choose any of the existing NPCs. If the author has been around for a while, you'll find his mod there.
If you are ever in doubt about a mod, go to the Nexus Mods website and search the mod title. It is all about the eye-candy.| Some mods will require to be the lowest mod, or at the bottom of the load order. The modder quickly sets the tone by disclaiming that their intention is not to create a realistic or human-like experience. Oh, this one is a classic! Dimon99's UNP Female Body mod provides a complete overhaul of the physical dimensions of Skyrim 's feminine cast.